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(No Model.)

J. C. CALDWELL. DEVICE FOR TILTING THE lOOL 0]? A SLOTTING MACHINE.

No. 409,451. Patented Aug. 20, 1889.

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James G. CaZCZWdL by his U'Zfiformqya UNITED STATES PATENT OEErcE,

JAMES C. CALDIVELL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CLARENCES. BEMENT, FREDERICK B. MILES, WILLIAM P. BEMENT, AND FRANK BEMENT, ALLOF SAME PLACE.

DEVICE FOR TIL-TING THE TOOL OF A SLOTTlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 409,451, dated August20, 1889. Application filed January 14, 1889. Serial No. 296,263. (Nomodel.)

To all whom it may concern.-

Be it known that I, JAMEs O. CALDWELL, a citizen of the United States,and a resident of Philadelphia, Pennsylvania, have invented certainImprovements in Tool-Tilting Devices for Slotting-Machines, of which thefollowing is a specification.

The object of my invention is to automatically throw the tool of aslotting-machine away from the work on its return movement. This objectI attain in the following manner, reference being had to theaccompanying drawings, in which Figure 1 is a side view of sufficient ofa slotting-machine to illustrate my invention. Fig. 2 is a perspectiveView of a portion of the machine; and Fig. 3 is a side View of part ofthe machine, showing the toolcarrier tilted. Fig. 4 is a view of mydevice in its simplest form.

My invention is mainly intended for use on large and heavyslotting-machines; but it will be evident that it can be used on anymachine in which the tool or the work travels and the tool cuts onlyduring .its movement in one direction.

A is the frame of the machine, and B is a continuously rotating shaft onwhich is mounted the disk B, a reciprocating slide D being adapted toways a a on the frame A and being connected to the disk by a rod E,which is pivoted to an adjustable pin d on the slide and to anadjustable crank-pin b on the disk B. At the lower end of the slide ispivoted a tool-holder F, having a series of transverse T-slots, in whichthe heads of securing-bolts e are held, as shown in the drawings, thetool a: in the present instance being held in position by two bars ff,secured to the tool-holder by the securing-bolts e e. The tool-holder ispivoted at G, and a spring I, fastened to the slide D and bearingagainst the upper portion of the tool-holder, tends to keep it alwaysagainst the slide and to force the tool out into position; but whereheavy work is to be done and a long out made the tool even with thisconstruction would on its return movement bear against the cut surfaceof the metal, so that the tool would in time become worn away. I preventthis in the following manner: On the frame A, at the side of the slideD, I secure a plate M, which acts as a trackway and is provided with anundercut groove, and in this undercut groove I adjustably secure a baron by means of a set screw or screws m. This bar on has at its lower enda recess or bevel n, for a purpose described hereinafter. Mounted on thepost N, which is secured to the upper end of the tool-carrier, is an armP, on which is a sleeve Q, carrying a pivoted arm S, provided at itsouter end with a friction-wheel s. This sleeve Q is adjustable toward orfrom the post N, being held in position by means of a spring-pawl qacting in conjunction with a ratchet p on the lower edge of the arm P.The object of adjusting this sleeve Q is to provide for different formsof machines and for the peculiar character of the cut, and the arm S canfall to a line at right angles to the slide P, or more or less,depending upon the adjustment of a set-screw p.

It will be seen on referring to Fig. 2 that as the slide moves down, andas the tool is cutting, the arm S swings freely upward, but as theroller 8, which bears against the bar on, enters the recess n, (which isso set as to be at the end of the stroke,) the arm S assumes a positionnearly at right angles to the slide, and consequently on the raising ofthe slide the roller will be pushed out of the groove, and the lever Swill be moved bodily forward and consequently will push the upper end ofthe tool-carrier out, and the tool itself will be drawn in toward theslide and away from its work, and it will thus be raised free fromcontact with said work, and will not be injured on the return movementof the slide, but as soon as the upward stroke is finished and the slidebegins to return the arm S will again swing freely upward and the toolbe allowed to resume the cutting position. The bar or is adjustable, inorder to accommodate the different strokes of the slide.

The friction-roller in some cases may be dispensed with; but I prefer touse it in all cases. In fact, the bar P may extend to and bear againstthe bar M, or may be .provided with a friction-roller, as shown in Fig.4, thus dispensing with the sleeve Q and the arm S.

I claim as my invention 1. The combination, in a slotting-machine havinga cutter-slide, of a pivoted tool-holder on said slide, and an armpivoted to said tool holder adapted to bear against a trackway and throwthe tool away from its work on the return movement of the cutter-slide,substantially as described.

2. The combination of a reciprocating slide and a tool-holder pivotedthereto with an arm pivoted to said tool-holder and bearing against anadjustable bar beveled at its lower end, the whole acting to force thetool carried by said holder away from its work on. its return movement,substantially as described.

3. The combination of the reciprocating slide, the tool-holder pivotedthereto and carrying a cutting-tool, an arm pivoted to the upper end ofsaid tool-holder, and a sleeve adjustable on said arm and carrying asecond arm, with a bar having at its lower end a recess 0r beveled end,into which the second arm will drop at the end of the stroke of theslide, the whole acting to force the tool away from its work on itsreturn movement, substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of subscribing" witnesses.

JAMES C. OALDVVELL.

Vitnesses:

JAMES S. CRoss, ARTHUR F. TRETHEWAY, F. A. ZIPPERLEIN.

